Walter ii



W. H. KNIGHT; ELECTRIC MOTOR REGULATOR.

' (No Model.)

Patented May 20, 1890.

INVENTOR 4%, W

I 7 .//3Ig panying drawings, whereina l IVALTER II. KNIGHT, OF NEW YORK,N. Y.

ELECTRIC-MOTOR REGULATOR.

SPECIFICATION forming part of Letters Patent No. 428,169, dated May 20,1890.

Original application filed March 13, 1386, Serial No, 195,183. Dividedand this application filed June 5,1889. Serial No,3l3,229-

(N0 model.)

To aZZ whom it may concern.-

Be it known that I, IVALTER II. KNIGHT, a citizen of the United States,residing at New York, in the county of New York, State of New York, haveinvented certain new and useful Improvements in Electric-Motor Regu- Ilators, of which the following is a specitica- I Figure 1 is adiagrammatical view of a reversing mechanism and a regulating mechanismfor an electric motor so connected as to embody my invention. Figs. 2and 3 show the alternative condition to that shown in Fig. 1, whereinthe reversing mechanism. is set in opposite directions respectively.

tion. In the drawings, A represents a reversing Myinvention, whichis adlvision of my apl device for an electric motor, which in this '10plication, Serial No. 195,133, filed March 13, case is shown as a leverfor shifting the posic tion of the brushes upon the commutator. The sameresult, however, may be accomplished by any other of the \'ell-knownmeans for that purpose. B is a regulator for the motor, consisting inthis case of a lever controlling the resistance, cutting out more orless of it at the will of the operator.

Any other controlling device by which a variation between the direct andcounter electro-motive forces is prevented from causing an injuriousflow of current to the motor may be employed.

0 is the resistancedever, provided with a grooved segment D.

1886, relates to controlling devices for elcetri motors. 1

It is especially adapted for motors working on a circuit of constantpotential, such as is employed for electric railways. In motors of acircuit of this character it is essential that a resistance or otherdevice for opposing the clectro motive force should be inserted in thecircuit whenever the motor is at rest or its counter electro-motiveforce substantially diminished. Since a reversal of the motor, ofcourse, reverses its counter electro-motive force, it is essential thatit should only be reversed when the motor is at rest, and when there issubstantially no current passing E is a eonnecting-rod from. the leverA, through it. A sudden reversal of the motor leading to a pivotedtriangular block F, provided with pins G, which pins in Fig. 1 extendinto a break in the lower flange of segment D and prevent any movementof lever O. In this condition the lever A is holding thecommutator-brush at a neutral point, so that no lead is given to themotor and the resistanceleve'r cannot be turned to throw out the resistance and admit current to the motor when it is not in a condition togenerate its counter electro-m otive force. \Vhen, however, thelever Ais turned to one side or the other to give a direction to the motor, theblock F is thrown into one or the other of the positions shown in Figs.2 and The pins G are then. thrown out of the path of the flange of D, sothat it may readily pass between them in either direction, whether theposition. taken be that of Fig. 2 or Fig. 3. The resistance can then becut out and the motor operated and regulated at will; but when any ofthe resistance is cutout by a movement of lever C in either directionfrom the position of Fig. 1 the flange of D comes in between the twopins G and prevents any movement of block F, thereby locking the lever Ain position. By

when in operation so affects the counter eleetro-motive force thatunless a resistance. is inserted the sudden flow of current which ensuesis so great as to burn out the machine. Moreover, when the reversingdevice is a switch controlling the direction of current in either thefield magnet or armature, it is apt to be injured by operating it. whilethe our rent is passing.

My invention consists in providing a re versing mechanism for the motorwith a stop or look, so that it can be operated only when there is asullicient amount of resistance insorted to prevent injur and it,furthermore, consists in providing a stop or look for the resistancecontroller or regulator of the machine, by which, when the reversingmechanism is at the neutral point, the resistance cannot be out out.These devices absolutely prevent reversal of the motor at an impropertime, and also the operation of the regulator unless the reversingmechanism is set in one direction or the other.

My invention is illustrated in the accomthis arrangement theleverAcannot be turned 1 of a regulator therefor, a stop or look for theto reverse the motor until the lever (T is regulator, and a reversingdevice for the mobrought back to the position of Fig. l with torconnected to said step, whereby the said the maximum resistance incircuit. stop is operated by the reversing device to 5 By the deviceabove described itwill be lock the regulator against movement, except 3(seen that the motor is at all times safe from when the reversing deviceis in a predeteraecident at the hands of reckless and inex minedposit-i011. perienced operators. 4:. The combination, with an electricmotor \Vhat I claim as new, and desire to secure on a constant-potentialcircuit, of a regulator 10 by Letters Patent, isand reversing devicetherefor, operated inde- 35 1. The combinatiomwith an electric motor,pendently of one another, and an intermediof a reversing device andregulator therefor, ate stop or lock connection, whereby the regumeansfor operating the same, and a stop for later and reversing device eachcontrols the the reversing device, controlled by the regumovement of theother.

I 5 later, whereby the reversing device can be 5. The combination,withan electric motor 40 operated only when the regulator is in a preon aconstant-potential circuit, of a reversingdetermined position. levertherefor,aregulating-lever,atlangedseg- *2. The combination, with anelectric motor, ment on the regulator-lever, a pivoted block of areversing device therefor, a regulator, having stops engaging with theilange of the 20 a stop for the reversing device, controlled by segment,and a connection therefrom to the 5 the regulator and locking thereversing dereversing-lever, substantially as described. vice, so as toprevent its being operated QX- \VA'L'iER ll. KNIGHT. cept when theregulator is substantially at the point of maximum control.

25 3. The combinatiomwith an electric motor,

Attest:

(I. H. SWAN, R. W. 1-;LAcKwELL.

